Final answer:
Approximately 25% of children experience growing pains in areas such as their thighs, calves, behind their knees, and sometimes in their arms during childhood.
Step-by-step explanation:
Approximately 25% of children experience growing pains in their thighs, calves, or behind their knees, and occasionally in their arms. Growing pains are a common complaint during childhood, particularly among young children and pre-adolescents. These pains are usually felt in the muscles, are not associated with any physical changes to the legs, and can be mild or moderate in intensity.